DEFINITION: An audible or physical noise due to a faulty component or damaged components causing a loose or misaligned exhaust system resulting in a rattle or vibration noise, i.e. buzz, groan, hum. Refer to Symptoms - Engine Exhaust prior to beginning this table.

Popping or hissing noise

Exhaust leak. Refer to Exhaust Leakage .

Loud exhaust

1. Compare to a known good vehicle.
2. Inspect for a damaged or failed silencer.
3. Replace the faulty silencer. Refer to Exhaust System Replacement : 2.0L Diesel LNP → 1.6L LDE, LXT, LXV, 1.8L 2H0, and LUW → 2.0L Diesel LLW .

External rattle or vibration noise

1. Inspect for a bent or loose hanger, loose heat shield, or loose clamp.
2. Inspect for an exhaust pipe causing interference.
3. Repair or replace the affected component. Refer to the affected component's service procedure.

Internal rattle

1. Test the components by tapping with a rubber mallet to confirm a rattle.
2. Replace the faulty catalytic converter, or silencer. Refer to one of the following procedures:

•	Catalytic Converter Replacement : 1.4L LUH and LUJ → 1.6L LXT,L2W → 1.6L LDE, LXV, 1.8L 2H0, and LUW → 2.0L Diesel LLW

•	Exhaust System Replacement : 2.0L Diesel LNP → 1.6L LDE, LXT, LXV, 1.8L 2H0, and LUW → 2.0L Diesel LLW